var Screen = (function () { var W = 0, H = 0; // dimensions var inited = false; var cursor = { a: false, // active (blink state) x: 0, // 0-based coordinates y: 0, fg: 7, // colors 0-15 bg: 0, attrs: 0, suppress: false, // do not turn on in blink interval (for safe moving) hidden: false, // do not show hanging: false, // xenl }; var screen = []; var blinkIval; var frakturExceptions = { 'C': '\u212d', 'H': '\u210c', 'I': '\u2111', 'R': '\u211c', 'Z': '\u2128', }; // for BEL var audioCtx = null; try { audioCtx = new (window.AudioContext || window.audioContext || window.webkitAudioContext)(); } catch (er) { console.error("Browser does not support AudioContext, can't beep.", er); } /** Get cell under cursor */ function _curCell() { return screen[cursor.y*W + cursor.x]; } /** Safely move cursor */ function cursorSet(y, x) { // Hide and prevent from showing up during the move cursor.suppress = true; _draw(_curCell(), false); cursor.x = x; cursor.y = y; // Show again cursor.suppress = false; _draw(_curCell()); } /** Update cell on display. inv = invert (for cursor) */ function _draw(cell, inv) { if (!cell) return; if (typeof inv == 'undefined') { inv = cursor.a && cursor.x == cell.x && cursor.y == cell.y; } var elem = cell.e, fg, bg, cn, t; // Colors fg = inv ? cell.bg : cell.fg; bg = inv ? cell.fg : cell.bg; // Update elem.textContent = t = (cell.t + ' ')[0]; cn = 'fg' + fg + ' bg' + bg; if (cell.attrs & (1<<0)) cn += ' bold'; if (cell.attrs & (1<<2)) cn += ' italic'; if (cell.attrs & (1<<3)) cn += ' under'; if (cell.attrs & (1<<4)) cn += ' blink'; if (cell.attrs & (1<<5)) { cn += ' fraktur'; // perform substitution if (t >= 'a' && t <= 'z') { t = String.fromCodePoint(0x1d51e - 97 + t.charCodeAt(0)); } else if (t >= 'A' && t <= 'Z') { // this set is incomplete, some exceptions are needed if (frakturExceptions.hasOwnProperty(t)) { t = frakturExceptions[t]; } else { t = String.fromCodePoint(0x1d504 - 65 + t.charCodeAt(0)); } } elem.textContent = t; } if (cell.attrs & (1<<6)) cn += ' strike'; if (cell.attrs & (1<<1)) { cn += ' faint'; // faint requires special html - otherwise it would also dim the background. // we use opacity on the text... elem.innerHTML = '' + e(elem.textContent) + ''; } elem.className = cn; } /** Show entire screen */ function _drawAll() { for (var i = W*H-1; i>=0; i--) { _draw(screen[i]); } } function _rebuild(rows, cols) { W = cols; H = rows; /* Build screen & show */ var e, cell, scr = qs('#screen'); // Empty the screen node while (scr.firstChild) scr.removeChild(scr.firstChild); screen = []; for(var i = 0; i < W*H; i++) { e = mk('span'); (function() { var x = i % W; var y = Math.floor(i / W); e.addEventListener('click', function () { Input.onTap(y, x); }); })(); /* End of line */ if ((i > 0) && (i % W == 0)) { scr.appendChild(mk('br')); } /* The cell */ scr.appendChild(e); cell = { t: ' ', fg: 7, bg: 0, // the colors will be replaced immediately as we receive data (user won't see this) attrs: 0, e: e, x: i % W, y: Math.floor(i / W), }; screen.push(cell); _draw(cell); } } /** Init the terminal */ function _init() { /* Cursor blinking */ clearInterval(blinkIval); blinkIval = setInterval(function () { cursor.a = !cursor.a; // TODO try to invent a new way to indicate "hanging" - this is copied from gtkterm if (cursor.hidden || cursor.hanging) { cursor.a = false; } if (!cursor.suppress) { _draw(_curCell(), cursor.a); } }, 500); // blink attribute setInterval(function () { $('#screen').removeClass('blink-hide'); setTimeout(function() { $('#screen').addClass('blink-hide'); }, 800); // 200 ms ON }, 1000); inited = true; } /** Decode two-byte number */ function parse2B(s, i) { return (s.charCodeAt(i++) - 1) + (s.charCodeAt(i) - 1) * 127; } /** Decode three-byte number */ function parse3B(s, i) { return (s.charCodeAt(i) - 1) + (s.charCodeAt(i+1) - 1) * 127 + (s.charCodeAt(i+2) - 1) * 127 * 127; } var SEQ_SET_COLOR_ATTR = 1; var SEQ_REPEAT = 2; var SEQ_SET_COLOR = 3; var SEQ_SET_ATTR = 4; function _load_content(str) { var i = 0, ci = 0, j, jc, num, num2, t = ' ', fg, bg, attrs, cell; if (!inited) _init(); // Set size num = parse2B(str, i); i += 2; // height num2 = parse2B(str, i); i += 2; // width if (num != H || num2 != W) { _rebuild(num, num2); } // console.log("Size ",num, num2); // Cursor position num = parse2B(str, i); i += 2; // row num2 = parse2B(str, i); i += 2; // col cursorSet(num, num2); // console.log("Cursor at ",num, num2); // Attributes num = parse2B(str, i); i += 2; // fg bg bold hidden cursor.hidden = !(num & 0x0001); cursor.hanging = !!(num & 0x0002); // console.log("Attributes word ",num.toString(16)+'h'); Input.setAlts( !!(num & 0x0004), // cu !!(num & 0x0008), // np !!(num & 0x0010) // fn ); fg = 7; bg = 0; attrs = 0; // Here come the content while(i < str.length && ci> 4; attrs = (num & 0xFF00)>>8; } else if (jc == SEQ_SET_COLOR) { num = parse2B(str, i); i += 2; fg = num & 0x0F; bg = (num & 0xF0) >> 4; } else if (jc == SEQ_SET_ATTR) { num = parse2B(str, i); i += 2; attrs = num & 0xFF; } else if (jc == SEQ_REPEAT) { num = parse2B(str, i); i += 2; // console.log("Repeat x ",num); for (; num>0 && ci 0 ? e(s) : " "; x.style.opacity = s.length > 0 ? 1 : 0.2; }); } function _beep() { var osc, gain; if (!audioCtx) return; // Main beep osc = audioCtx.createOscillator(); gain = audioCtx.createGain(); osc.connect(gain); gain.connect(audioCtx.destination); gain.gain.value = 0.5; osc.frequency.value = 750; osc.type = 'sine'; osc.start(); osc.stop(audioCtx.currentTime+0.05); // Surrogate beep (making it sound like 'oops') osc = audioCtx.createOscillator(); gain = audioCtx.createGain(); osc.connect(gain); gain.connect(audioCtx.destination); gain.gain.value = 0.2; osc.frequency.value = 400; osc.type = 'sine'; osc.start(audioCtx.currentTime+0.05); osc.stop(audioCtx.currentTime+0.08); } /** Load screen content from a binary sequence (new) */ function load(str) { var content = str.substr(1); switch(str.charAt(0)) { case 'S': _load_content(content); break; case 'T': _load_labels(content); break; case 'B': _beep(); break; default: console.warn("Bad data message type, ignoring."); } } return { load: load, // full load (string) }; })(); /** Handle connections */ var Conn = (function() { var ws; function onOpen(evt) { console.log("CONNECTED"); } function onClose(evt) { console.warn("SOCKET CLOSED, code "+evt.code+". Reconnecting..."); setTimeout(function() { init(); }, 200); // this happens when the buffer gets fucked up via invalid unicode. // we basically use polling instead of socket then } function onMessage(evt) { try { //console.log("RX: ", evt.data); // Assume all our messages are screen updates Screen.load(evt.data); } catch(e) { console.error(e); } } function doSend(message) { console.log("TX: ", message); if (!ws) return; // for dry testing if (ws.readyState != 1) { console.error("Socket not ready"); return; } if (typeof message != "string") { message = JSON.stringify(message); } ws.send(message); } function init() { ws = new WebSocket("ws://"+_root+"/term/update.ws"); ws.onopen = onOpen; ws.onclose = onClose; ws.onmessage = onMessage; console.log("Opening socket."); // Ask for initial data $.get('http://'+_root+'/term/init', function(resp, status) { if (status !== 200) location.reload(true); console.log("Data received!"); Screen.load(resp); showPage(); }); } return { ws: null, init: init, send: doSend }; })(); /** User input */ var Input = (function() { var opts = { np_alt: false, cu_alt: false, fn_alt: false, }; function sendStrMsg(str) { Conn.send("STR:"+str); } function sendPosMsg(y, x) { Conn.send("TAP:"+y+','+x); } function sendBtnMsg(n) { Conn.send("BTN:"+n); } function fa(alt, normal) { return opts.fn_alt ? alt : normal; } function ca(alt, normal) { return opts.cu_alt ? alt : normal; } function na(alt, normal) { return opts.np_alt ? alt : normal; } function _bindFnKeys() { var keymap = { 'tab': '\x09', 'backspace': '\x08', 'enter': '\x0d', 'ctrl+enter': '\x0a', 'esc': '\x1b', 'up': ca('\x1bOA', '\x1b[A'), 'down': ca('\x1bOB', '\x1b[B'), 'right': ca('\x1bOC', '\x1b[C'), 'left': ca('\x1bOD', '\x1b[D'), 'home': fa('\x1bOH', '\x1b[1~'), 'insert': '\x1b[2~', 'delete': '\x1b[3~', 'end': fa('\x1bOF', '\x1b[4~'), 'pageup': '\x1b[5~', 'pagedown': '\x1b[6~', 'f1': fa('\x1bOP', '\x1b[11~'), 'f2': fa('\x1bOQ', '\x1b[12~'), 'f3': fa('\x1bOR', '\x1b[13~'), 'f4': fa('\x1bOS', '\x1b[14~'), 'f5': '\x1b[15~', // note the disconnect 'f6': '\x1b[17~', 'f7': '\x1b[18~', 'f8': '\x1b[19~', 'f9': '\x1b[20~', 'f10': '\x1b[21~', // note the disconnect 'f11': '\x1b[23~', 'f12': '\x1b[24~', 'shift+f1': fa('\x1bO1;2P', '\x1b[25~'), 'shift+f2': fa('\x1bO1;2Q', '\x1b[26~'), // note the disconnect 'shift+f3': fa('\x1bO1;2R', '\x1b[28~'), 'shift+f4': fa('\x1bO1;2S', '\x1b[29~'), // note the disconnect 'shift+f5': fa('\x1b[15;2~', '\x1b[31~'), 'shift+f6': fa('\x1b[17;2~', '\x1b[32~'), 'shift+f7': fa('\x1b[18;2~', '\x1b[33~'), 'shift+f8': fa('\x1b[19;2~', '\x1b[34~'), 'shift+f9': fa('\x1b[20;2~', '\x1b[35~'), // 35-38 are not standard - but what is? 'shift+f10': fa('\x1b[21;2~', '\x1b[36~'), 'shift+f11': fa('\x1b[22;2~', '\x1b[37~'), 'shift+f12': fa('\x1b[23;2~', '\x1b[38~'), 'np_0': na('\x1bOp', '0'), 'np_1': na('\x1bOq', '1'), 'np_2': na('\x1bOr', '2'), 'np_3': na('\x1bOs', '3'), 'np_4': na('\x1bOt', '4'), 'np_5': na('\x1bOu', '5'), 'np_6': na('\x1bOv', '6'), 'np_7': na('\x1bOw', '7'), 'np_8': na('\x1bOx', '8'), 'np_9': na('\x1bOy', '9'), 'np_mul': na('\x1bOR', '*'), 'np_add': na('\x1bOl', '+'), 'np_sub': na('\x1bOS', '-'), 'np_point': na('\x1bOn', '.'), 'np_div': na('\x1bOQ', '/'), // we don't implement numlock key (should change in numpad_alt mode, but it's even more useless than the rest) }; for (var k in keymap) { if (keymap.hasOwnProperty(k)) { bind(k, keymap[k]); } } } function bind(combo, str) { // mac fix - allow also cmd if (combo.indexOf('ctrl+') !== -1) { combo += ',' + combo.replace('ctrl', 'command'); } // unbind possible old binding key.unbind(combo); key(combo, function (e) { e.preventDefault(); sendStrMsg(str) }); } function _initKeys() { // This takes care of text characters typed window.addEventListener('keypress', function(evt) { var str = ''; if (evt.key) str = evt.key; else if (evt.which) str = String.fromCodePoint(evt.which); if (str.length>0 && str.charCodeAt(0) >= 32) { // console.log("Typed ", str); sendStrMsg(str); } }); // ctrl-letter codes are sent as simple low ASCII codes for (var i = 1; i<=26;i++) { bind('ctrl+' + String.fromCharCode(96+i), String.fromCharCode(i)); } bind('ctrl+]', '\x1b'); // alternate way to enter ESC bind('ctrl+\\', '\x1c'); bind('ctrl+[', '\x1d'); bind('ctrl+^', '\x1e'); bind('ctrl+_', '\x1f'); _bindFnKeys(); } function init() { _initKeys(); // Button presses qsa('#buttons button').forEach(function(s) { s.addEventListener('click', function() { sendBtnMsg(+this.dataset['n']); }); }); } return { init: init, onTap: sendPosMsg, sendString: sendStrMsg, setAlts: function(cu, np, fn) { if (opts.cu_alt != cu || opts.np_alt != np || opts.fn_alt != fn) { opts.cu_alt = cu; opts.np_alt = np; opts.fn_alt = fn; // rebind keys - codes have changed _bindFnKeys(); } }, }; })(); window.termInit = function () { Conn.init(); Input.init(); };